MySQL操作Blob字段工具(Java)

Navicat工具可以很好的查看Blob中的文本数据，可视对于二进制数据，没有办法查看，我希望有一个工具可以简单的读取和写入数据库中的BLOB字段进行一些测试工作，我简单的用java实现了这个小工具，下文贴出工具类的源码（超级简单），如果只是解决工作中修改BLOG字段，那么直接下载工具就可以了，希望对您有帮助。觉得好用，或者有问题，请留言，谢谢。
MySQLBlobTools工具下载地址

工具简要介绍

一个简单的java实现的命令行工具，可以对单条记录的Blob二进制数据与文件的交互操作。还可以通过脚本实现批量处理。工具简单实现方法：

java -jar MySQLBlobTools.jar -u -d "jdbc:mysql://localhost:3306/test?user=root&password=test&useUnicode=true" -f "./DVP-12SA/DVP-12SA.zip" -s "update protconfig set protocol_cOntent=? where id=?" -i 5

参数说明如下：

• -r 从记录中读Blob数据并写入文件(-f参数)
• -u 用文件内容更新数据库中的Blob字段
• -w 插入一条Blob记录
• -f 需要读/写的文件名
• -d 数据库连接串，需要指定用户名和密码信息
• -s SQL语句，更新需要指定两个参数，第一个参数为内容，第二个参数为操作的记录条件，读和插入只需一个参数
• -i 操作记录的ID信息，读和更新需要指定

代码

代码共两个文件，需要mysql的驱动jar包。

命令行参数解析

参见Java GetOpt类

MySQLBlobTools类

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;


/**
 * MySQL Blob tools
 * @author yinhaibo
 * @since 2017
 * @version 1.00
 */
public class MySQLBlobTools {
    private static String VERSION = "0.0.1";
    private final static int MODE_INVALID = -1;
    private final static int MODE_READ = 0;
    private final static int MODE_WRITE = 1;
    private final static int MODE_UPDATE = 2;

    public static void main(String[] args){
        String DBUrl = null;
        String File = null;
        String SQL = null;
        String Id = null;
        int mode = MODE_INVALID;

        GetOpt getopt = new GetOpt(args, "hvrwuf:s:i:d:");
        int c;
        while((c = getopt.getNextOption()) != -1){
            switch(c){
            case 'h':
                printHelpMessage();
                System.exit(0);
            case 'v':
                printVersionMessage();
                System.exit(0);
            case 'r':
            case 'w':
            case 'u':
                if (mode != MODE_INVALID){
                    printHelpMessage();
                    System.out.println();
                    System.out.println("Only a mode parameter can specified. r = read, w = write, u = update.");
                    System.exit(0);
                }
                if (c == 'r'){
                    mode = MODE_READ;
                }else if(c == 'w'){
                    mode = MODE_WRITE;
                }else if(c == 'u'){
                    mode = MODE_UPDATE;
                }
                break;
            case 'f':
                File = getopt.getOptionArg();
                break;
            case 's':
                SQL = getopt.getOptionArg();
                break;
            case 'i':
                Id = getopt.getOptionArg();
                break;
            case 'd':
                DBUrl = getopt.getOptionArg();
                break;
            default:
                printHelpMessage();
                System.exit(0);
            }
        }

        if (File == null || DBUrl == null || SQL == null){
            printHelpMessage();
            System.out.println();
            System.out.println("Need -f, -d -s parameter specified.");
            System.exit(0);
        }

        int rv = 0;
        switch(mode){
        case MODE_READ:
            rv = readBlob(File, DBUrl, SQL, Id);
            break;
        case MODE_WRITE:
            rv = writeBlob(File, DBUrl, SQL);
            break;
        case MODE_UPDATE:
            rv = updateBlob(File, DBUrl, SQL, Id);
            break;
        }

        System.exit(rv);
    }

    private static int updateBlob(String filename, String dBUrl, String SQL, String id) {
        FileInputStream fis = null;
        Connection cOnn= null;
        PreparedStatement pstmt = null;
        try {
            Class.forName("org.gjt.mm.mysql.Driver").newInstance();
            cOnn= DriverManager.getConnection(dBUrl);

            File file = new File(filename);
            fis = new FileInputStream(file);
            pstmt = conn.prepareStatement(SQL);
            // //这种方法原理上会丢数据，因为file.length()返回的是long型
            pstmt.setBinaryStream(1, fis, fis.available()); // 第二个参数为文件的内容
            pstmt.setInt(2, Integer.parseInt(id));
            pstmt.executeUpdate();
            System.out.println("Success to write a blob data.");
            return 1;
        } catch (Exception ex) {
            System.out.println("[blobInsert error : ]" + ex.toString());
        } finally {
            // 关闭所打开的对像//
            try {
                pstmt.close();
                fis.close();
                conn.close();
            } catch (IOException e) {
            } catch (SQLException e) {
            }
        }

        return 0;
    }

    private static int writeBlob(String filename, String dBUrl, String SQL) {
        FileInputStream fis = null;
        Connection cOnn= null;
        PreparedStatement pstmt = null;
        try {
            Class.forName("org.gjt.mm.mysql.Driver").newInstance();
            cOnn= DriverManager.getConnection(dBUrl);

            File file = new File(filename);
            fis = new FileInputStream(file);
            pstmt = conn.prepareStatement(SQL);
            // //这种方法原理上会丢数据，因为file.length()返回的是long型
            pstmt.setBinaryStream(1, fis, fis.available()); // 第二个参数为文件的内容
            pstmt.executeUpdate();
            pstmt.close();
            pstmt = conn.prepareStatement("SELECT LAST_INSERT_ID()");
            ResultSet rs = pstmt.executeQuery();
            rs.next();
            rs.close();
            pstmt.close();
            System.out.println("Success to insert a blob record.");
            return rs.getInt(1);
        } catch (Exception ex) {
            System.out.println("[blobInsert error : ]" + ex.toString());
        } finally {
            // 关闭所打开的对像//
            try {
                pstmt.close();
                fis.close();
                conn.close();
            } catch (IOException e) {
            } catch (SQLException e) {
            }
        }

        return 0;
    }

    private static int readBlob(String filename, String dBUrl, String SQL, String id) {
        Connection cOnn= null;
        PreparedStatement pstmt = null;
        byte[] Buffer = new byte[4096];

        try {
            Class.forName("org.gjt.mm.mysql.Driver").newInstance();
            cOnn= DriverManager.getConnection(dBUrl);

            pstmt = conn.prepareStatement(SQL);
            // //这种方法原理上会丢数据，因为file.length()返回的是long型
            pstmt.setInt(1, Integer.parseInt(id));
            ResultSet rs = pstmt.executeQuery();
            rs.next();

            File file = new File(filename);
            if (!file.exists()) {
                file.createNewFile(); // 如果文件不存在，则创建
            }
            FileOutputStream fos = new FileOutputStream(file);
            InputStream is = rs.getBinaryStream(1);
            int size = 0;
            long totalLen = 0;
            while ((size = is.read(Buffer)) != -1) {
                totalLen += size;
                fos.write(Buffer, 0, size);
            }
            fos.close();
            System.out.println("Read blob data success, total length:" + totalLen);
            return 1;
        } catch (Exception ex) {
            System.out.println("Read blob data error : ]" + ex.toString());
        } finally {
            // 关闭所打开的对像//
            try {
                pstmt.close();
                conn.close();
            } catch (SQLException e) {
            }
        }

        return 0;
    }

    private static void printVersionMessage() {
        System.out.println("MySQLBlobTools was make to operate blob field in mysql database. The tools just can process only a record.");
        System.out.println("Author: yinhaibo Email: yhb_yinhaibo@163.com");
        System.out.println("Version: " + VERSION);
    }

    private static void printHelpMessage() {
        printVersionMessage();
        System.out.println("-r read mode, need d, f, s, i parameters");
        System.out.println("-w write mode, need d, f, s, i parameters");
        System.out.println("-u update mode, need d, f, s, i parameters");
        System.out.println("-d  MySQL database uri, jdbc:mysql://localhost:3306/user?user=root&password=12345678");
        System.out.println("-f  file for reading or writing");
        System.out.println("-s , select blob from images where id=?, ? for i paramter");
        System.out.println("-i ");
        System.out.println("For example:");
        System.out.println("java MySQBlobTools.jar -r -f Blob.png -s \"select blob from images where id = ?\" -i 123");
        System.out.println("java MySQBlobTools.jar -w -f Blob.png -s \"insert into images (blob) values(?) \"");
        System.out.println("java MySQBlobTools.jar -u -f Blob.png -s \"update images set blob=? where id=?\" -i 123");
    }
}